ios - How to populate data in a tableView as alphabetical order while using section index -

i'm implementing app need show tableview. tableview needs have alphabetical search on right side clicking on letter needs show data starting letter. i've implemented vertical alphabet search , when user clicks on letter takes user particular section. problem every section has same data it's not populating according alphabet.

here code this. // here exhibitorarray contains info populate data in tableview.

- (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     return [self.exhibitorarray count]; }  - (nsstring *)tableview:(uitableview *)tableview titleforheaderinsection:(nsinteger)section {         return [[[uilocalizedindexedcollation currentcollation] sectiontitles] objectatindex:section];     }  - (nsarray *)sectionindextitlesfortableview:(uitableview *)tableview {         return [[uilocalizedindexedcollation currentcollation] sectionindextitles];      }  - (nsinteger)tableview:(uitableview *)tableview sectionforsectionindextitle:(nsstring *)title atindex:(nsinteger)index {         return [[uilocalizedindexedcollation currentcollation] sectionforsectionindextitleatindex:index];   - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     // return number of rows in section.     return [self.exhibitorarray count]; } - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     static nsstring *cellidentifier = @"cell";     uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:nil];     if (cell == nil) {         cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstylesubtitle reuseidentifier:cellidentifier];      }     [self.exhibitortableview setseparatorinset:uiedgeinsetsmake(0, 0, 0, 0)];      uiview* bgview = [[uiview alloc] initwithframe:cgrectmake(0, 0, 1, 1)];     bgview.opaque = yes;     bgview.backgroundcolor = [uicolor colorwithred:244.0f/255 green:245.0f/255 blue:246.0f/255 alpha:1.0];     [cell setbackgroundview:bgview];      uiimageview *defaultimage = [[uiimageview alloc]init];     [defaultimage setframe:cgrectmake(5.0f, 5.0f, 40.0f, 40.0f)];     [cell addsubview:defaultimage];      nsstring *urlstring = @"http://";     urlstring = [urlstring stringbyappendingstring:[nsstring stringwithformat:@"%@",[[self.exhibitorarray objectatindex:indexpath.row]valueforkey:@"image"]]];     nslog(@"%@",urlstring);      asyncimageview *asyncimageview = [[asyncimageview alloc] initwithframe:cgrectmake(0.0f, 0.0f, 40.0f, 40.0f)];     [asyncimageview setbackgroundcolor:[uicolor clearcolor]];     [asyncimageview loadimagefromurl:[nsurl urlwithstring:urlstring]];     [defaultimage addsubview:asyncimageview];     defaultimage.contentmode = uiviewcontentmodescaleaspectfit;     asyncimageview = nil;     defaultimage = nil;      nsstring *name_string = [[self.exhibitorarray objectatindex:indexpath.row]valueforkey:@"name"];      uilabel *user_name = [[ uilabel alloc]init ];     [user_name setframe:(cgrectmake(58, 5, 270, 25))];     [user_name setbackgroundcolor: [uicolor clearcolor]];     [user_name settext:name_string];     [user_name setfont:[uifont fontwithname:@"roboto-light" size:14]];     [user_name settextalignment:nstextalignmentleft];     [user_name settextcolor:[uicolor colorwithred:93.0f/255 green:94.0f/255 blue:94.0f/255 alpha:1.0]];     [cell addsubview:user_name];     user_name = nil;      [cell setaccessorytype:uitableviewcellaccessorydisclosureindicator];      return cell; } 

output of coming this.

the following wrong:

- (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     // return number of rows in section.     return [self.exhibitorarray count]; } 

you have separate arrays every section. let's different array letter 'a' , different array letter 'b' , on. then, based on section index, data correct array.

for example can use array of arrays array[section][index] or dictionary dict['a'][index].

so above function has be:

- (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     // based on array of arrays     return [[self.exhibitorarray objectatindex:indexpath.section] count]; } 

and then, in cellforrowatindexpath: can use

nsstring *name_string = [[[self.exhibitorarray objectatindex:indexpath.section] objectatindex:indexpath.row] valueforkey:@"name"]; 

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update: convert exhibitorarray

- (void)convertarray {     //nsmutablearray *exhibitorarray = [[nsmutablearray alloc] initwitharray:@[@"abra", @"catabra"]];      nsarray *data = [exhibitorarray copy];     exhibitorarray = [[nsmutablearray alloc] initwithcapacity:27];     // 27 elements, 26 a-z plus 1 '#'     (int i=0; i<27; i++)           [exhibitorarray addobject:[[nsmutablearray alloc] init]];      int firstasciipos = (int)[@"a" characteratindex:0];     (int i=0; i<[data count]; i++)     {         int index = (int)[[[data objectatindex:i] uppercasestring] characteratindex:0] - firstasciipos;         if (index < 0 || index > 25)         {             // not between , z, add '#'             index = 26;         }         [[exhibitorarray objectatindex:index] addobject:[data objectatindex:i]];     } } 

the above code converts array two-dimensional array based on alphabet letters. please feel free change according code , don't forget handle memory deallocations if not using arc.